Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f094a8a4cb2d484…

MALICIOUS

PDF

83.8 KB Created: 2021-08-20 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b22df70257515a1e2959e260ca114604 SHA-1: e9ee414d5724d64bff3e1fc4c3311b1c72b7d76a SHA-256: 3f094a8a4cb2d484504e48957a77046bceee7be06d4ddd03ac6a8026c0418d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee422fd950168bdae24e62f581d25743/wodilipogufo.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/melomatiminoterobigareze.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/65148559479.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/kuxebivagibub.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/buzelagofedibobakepax.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7afa2158af---51719042304.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/14383110371.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c825dc9b---75411980912.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/vafuxuxu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7rs55t1l3176tcdmag6994tii6/bufivududomanegifu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/40333187288.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5tfa825ds57unt7aduu7kgq14/59258090872.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/90898154044.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/9564657326.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vtbritd9cmml8o3cqrprho838q/6669942521.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060418042573499.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7fbd0c9d---21695164808.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6bb56ccf30ec6efe97f482c6c4d4148b/lasakelexigimavagaxozamav.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/jelivitefimaxedubamera.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c37fdff3bda---16130462066.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d76347dbd---visof.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/590822b338c0d573983db84a7e5555d5/60653534323.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98893ac669---votujisosekokobisofa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/0532474431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cyber+power+inverter+error+codesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 10736 bytes
SHA-256: 5381d462a28f6a4195b679c551e8b1637eadbb5edbcff4ee62b981869a64ecf6
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 16416 bytes
SHA-256: 13f6b895517f698b827fe79ac107b9f159217f3c10093ae4e36166265637ea2a